Yes, if you take a cylinder then it can give you different types of shadows.

Introduction:
Yes, it is possible to create a shape that gives a circular shadow when held in one way and a rectangular shadow when held in another way. This can be achieved by designing a shape that has different cross sections when viewed from different angles.

Designing the Shape:
To create such a shape, we can start with a cylinder and modify it to have a unique cross-sectional shape. The cross section of the shape will determine the shadow it casts when held in different orientations.

Circular Shadow:
When the shape is held in a certain way, it should cast a circular shadow. To achieve this, we can design one end of the shape to be a perfect circle. This can be done by rounding off the edges of the cylinder. When the light source is directly above the circular end, the shape will cast a circular shadow on the ground.

Rectangular Shadow:
When the shape is held in a different orientation, it should cast a rectangular shadow. To achieve this, we can design the other end of the shape to have a rectangular cross section. This can be done by attaching a rectangular prism to the other end of the cylinder. When the light source is directly above the rectangular end, the shape will cast a rectangular shadow on the ground.

Transition:
When the shape is held in between the two orientations, the shadow cast will be a combination of a circle and a rectangle, resulting in a unique shadow shape.

Conclusion:
By designing a shape with a circular end and a rectangular end, we can create a shape that casts a circular shadow when held in one way and a rectangular shadow when held in another way. This shape will provide an interesting visual effect and can be used for various purposes, such as artistic installations or optical illusions.